Microanatomy of the digestive tract and accessory organs of the Japanese flathead (Inegocia japonica Cuvier, 1829) (Scorpaeniformes,Platycephalidae) |
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Authors: | Archig Jeamah Chanyut Sudtongkong Anan Kenthao Supapong Imsonpang Kitipong Angsujinda Natthawut Charoenphon Anjaree Inchan Piyamat Kongtueng Tappadit Mitparian Sinlapachai Senarat |
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Institution: | 1. Department of Marine Science and Environment, Faculty of Science and Fisheries Technology, Rajamangala University of Technology Srivijaya, Trang, Thailand;2. Department of Biology, Faculty of Science, Naresuan University, Phitsanulok, Thailand;3. Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Songkhla, Thailand;4. Aquatic Resources Research Institute, Chulalongkorn University, Bangkok, Thailand;5. Department of Anatomy, Faculty of Medical Science Naresuan University, Phitsanulok, Thailand;6. Department of Physiology, Faculty of Medical Science and Center of Excellence for Innovation in Chemistry, Naresuan University, Phitsanulok, Thailand;7. Central Laboratory, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand;8. Inland Aquaculture Research and Development Division, Department of Fisheries, Bangkok, Thailand |
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Abstract: | The Japanese flathead, Inegocia japonica Cuvier, 1829 is a commercially important fish in small-scale coastal fisheries in Thailand; however, an explanation of its digestive biology is missing. This study describes the digestive tract and accessory organs of I. japonica, using morphological and histological methods. The fish (10 individual fish, 24.5 ± 0.98 cm in total length) were obtained from Libong Island, Thailand. Integrated morphological and histological data showed that the digestive tract was composed of oesophagus, stomach, pyloric caeca and intestine, with accessory organs. All digestive tracts consisted of four layers, including mucosa, submucosa, muscularis and serosa. Two stomach regions were identified (cardiac and pyloric stomachs). Several clusters of gastric glands were identified in the cardiac stomach. Each gland was a unicellular structure. The apical surface of this gland contained the vacuolar cell. The intestine was lined with a simple columnar structure with goblet cells that was similar to pyloric caecum. Goblet cells were rare in the anterior intestine, in contrast to the posterior intestine where goblet cells were abundant. The numerous of hepatocyte was mostly observed in the liver, whereas an exocrine acinar cell of pancreas was also identified. The results of our observations provided the first information of the digestive tract of I. japonica and can be applied to advanced study, such as physiology and histopathology. |
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Keywords: | digestive histology gastric cell Japanese flathead fish Thailand |
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